EP0545934A1 - Filter apparatus for machine tool coolant. - Google Patents

Filter apparatus for machine tool coolant.

Info

Publication number
EP0545934A1
EP0545934A1 EP91910926A EP91910926A EP0545934A1 EP 0545934 A1 EP0545934 A1 EP 0545934A1 EP 91910926 A EP91910926 A EP 91910926A EP 91910926 A EP91910926 A EP 91910926A EP 0545934 A1 EP0545934 A1 EP 0545934A1
Authority
EP
European Patent Office
Prior art keywords
filter
minute openings
openings
contaminants
minute
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91910926A
Other languages
German (de)
French (fr)
Other versions
EP0545934B1 (en
EP0545934A4 (en
Inventor
Stephen N Mcewen
Jay M Creps
Scott M Mcewen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henry Filters Inc
Original Assignee
Henry Filters Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Henry Filters Inc filed Critical Henry Filters Inc
Publication of EP0545934A1 publication Critical patent/EP0545934A1/en
Publication of EP0545934A4 publication Critical patent/EP0545934A4/en
Application granted granted Critical
Publication of EP0545934B1 publication Critical patent/EP0545934B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/16—Cleaning-out devices, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/114—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/39—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type
    • B01D29/41—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type mounted transversely on the tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
    • B01D29/6476—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a rotary movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/18—Filters characterised by the openings or pores
    • B01D2201/184—Special form, dimension of the openings, pores of the filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/28—Position of the filtering element
    • B01D2201/282—Filtering elements with a horizontal rotation or symmetry axis

Definitions

  • This invention relates to filters for filter ⁇ ing industrial liquids such as machine tool coolants and more particularly to filtering elongated contaminants onto a fora inous surface.
  • the conventional filter element is comprised of a continuous length of wedge shaped wire wrapped around a drum-shaped support.
  • the filter element thereby includes elongated openings through which some elongated contaminants are allowed to pass if the contaminants are aligned in the direction of fluid movement as they strike the filter. The passage of these elongate contaminants allows the contaminants that pass through the filter to be recirculated to the machine tools.
  • An alternate type filter system that has been tried is fabricated from rectilinear mesh, wire cloth or the like. Although the minute square openings formed by the woven wire cloth are effective in preventing the passage of elongate contaminants, the surface is not a flat planar surface and thus becomes clogged when scrape cleaning is attempted.
  • An object of the present invention is to provide an improved filter apparatus for filtering industrial liquid such as machine tool coolant.
  • a further object of the invention is to provide an improved filter apparatus having a filter that provides improved scrape-cleanability of the filter surface.
  • a still further object of the invention is to provide a filter element that prevents movement of machining chips, particulate and also elongate contami ⁇ nants found in machine tool coolant from one side of the filter to the other side.
  • the filter apparatus includes a horizontal rotatable cylindrical drum filter in a settlement tank having a dragout conveyor.
  • the settle- ment tank contains industrial liquids such as machine tool coolant or the like containing machining chips. These chips are found in a wide spectrum of particle sizes and shapes, including elongate contaminants.
  • a circulating pump creates suction on one end of the drum filter.
  • the drum filter has a fora inous surface comprised of a non-reticulated metal screen having minute openings and having a smooth planar surface.
  • a doctor means is provided for scraping the foraminous surface to remove deposited contaminants.
  • the minute openings in the foraminous surface are generally in the range of between 50 and 250 microns and provide improved scrape cleanability to the surface while preventing movement of machining chips (particulate including elon- gate contaminants) from one side of the filter to the other side.
  • minute openings are generally 120 microns.
  • the minute openings in the direction of movement are conical in shape tapering outwardly in the direction of movement.
  • the minute openings in the direction of movement are hourglass in shape.
  • a method for filtering machine tool coolant contaminants including the elongate contaminates from the industrial liquid includes the steps of interposing a foraminous filter surface perforated with a plurality of minute openings configured to pass the fluid while preventing passage of contaminant into a flow of the contaminated industrial liquid.
  • FIGURE 1 is a perspective view of a filter system including a removable drum filter having a non- reticulated foraminous surface constructed in accordance with the present invention
  • FIGURE 2 is a sectional partial plan view of the filter system of Figure 1 illustrating the remov ⁇ ability of a drum filter assembly
  • FIGURE 3 is a perspective view of the drum filter assembly
  • FIGURE 4 is a perspective partial view of a disc filter assembly substitutable for the drum filter assembly in the filter system of Figure 1;
  • FIGURE 5 is a sectional plan view taken along lines 5-5 in Figure 4 of a disc filter element of the disc filter assembly of illustrating communication of the machine tool coolant;
  • FIGURE 6 is an exploded planar view taken along lines 6-6 in Figures 3 and 5 illustrating a section of a first embodiment of the foraminous non- reticulated surface of the filters of the present inven- tion;
  • FIGURE 7 is a cross-sectional view taken along lines 7-7 in Figure 6;
  • FIGURE 8 is an exploded planar view like Figure 6 illustrating a second embodiment of the foram ⁇ inous non-reticulated surface of the filters of the present invention.
  • FIGURE 9 is a cross-sectional view taken along lines 9-9 in Figure 8.
  • a filter apparatus for filtering machine tool coolant con- ⁇ tructed in accordance with the present invention is generally indicated by reference numeral 10.
  • apparatus 10. includes a filter assembly 12 which is easier to keep clean and that prevents machining chips, particulate as well as elongate contaminants in the coolant from being recircu ⁇ lated to the machine tools.
  • a settling tank 14 is set into a pit disposed below the floor level or elevation F in an industrial environment.
  • Tank 14 is generally rectilinear in configuration and has a sloping end wall or ramp 16 for use in conjunction with a dragout conveyor 18.
  • Tank 14 is comprised of two discrete compartments; a dirty or contaminated coolant compartment, designated 20, for receiving dirty coolant from trough T in communication with the machine tools, also not shown; and a clean coolant compartment 22 for receiving clean filtered coolant from tank 14.
  • drum filter 24 within dirty coolant compartment 20, there is provided a horizontally disposed drum filter assembly 24 between two parallel sides 26,28 of tank 14 for filter- ing the dirty coolant whereby clean coolant filtrate may be supplied machine tools as explained hereinafter.
  • drum filter 24 as best seen in Figure 3, has a foraminous surface 30 comprised of a non-reticu- lated metal screen having minute openings 32, as best seen in Figures 6-9, and a smooth planar surface. Minute openings 32 are preferably in the range of between 50 and 250 microns in diameter and most prefera ⁇ bly 120 microns.
  • minute openings 32 in the direction of coolant movement are conical, tapering outwardly.
  • minute openings 32 in the direction of coolant movement are hourglass in shape.
  • drum filter 24 collects a filter cake composed of machining chips (particulate including elongate contam ⁇ inants) from machine tool operations about its surface 30. Coolant is moved through the filter cake and ' surface 30 of the drum filter 24 into the interior of the drum. More particularly, a suction is drawn on the inside of drum 24 by pump P. Coolant in dirty filter tank compartment 20 thus passes through the filter cake and drum, and cleaned or filtered coolant is supplied by the pump P to the machine tools.
  • machining chips particulate including elongate contam ⁇ inants
  • Dragout conveyor 18 is conventional in con ⁇ struction and serves to remove both the solids settled out from the coolant and the filter cake removed from the filter drum 24 by a doctor blade 34 shown in Figure 3, both of which settle to the bottom of tank compart ⁇ ment 20.
  • Doctor blade 34 comprises a non-abrasive material, preferably a flexible plastic material, having a leading edge flexed to contact the surface 30 in a / - parallel relationship whereby the surface is easily cleaned.
  • the solids removed from the bottom of the tank compartment 20 by conveyor 18 are deposited in a suit ⁇ able receptacle, not shown, at the end of the conveyor.
  • Clean coolant compartment 22 includes an elevated or false floor 36 above the lower tank wall bottom and which defines a lower chamber 38 for receiv ⁇ ing clean coolant from the suction side of filter drum via conduit 40.
  • a main outlet conduit 42 Disposed in clean compartment 22 is a main outlet conduit 42 for connection with the machine tools.
  • clean coolant is supplied the machine tools from the suction side of filter 24 by way of chamber 38, pump P and outlet conduit 42.
  • the purpose of clean coolant compartment 22 is to provide a reservoir of clean coolant which can be supplied the machine tools when the drum filter 24 is indexed for cleaning.
  • a valve not shown, is opened affording communication between the clean coolant in chamber 38 and the clean coolant in the remainder of clean coolant compartment 22 above floor 36.
  • pump P suction is applied to the clean coolant in compartment 22 to supply coolant to the machine tools.
  • the suction is also removed with respect to the inside of the drum filter assembly 24 to facili ⁇ tate cleaning filter cake from the outside surface of the drum.
  • drum filter 24 is shown to have axial extensions at each end, one end comprising a ball duct joint 50, the socket 52 of which is placed in an aperture 54 in the side wall 28 of tank 12; and the other end of which filter 24 is pro ⁇ vided with a spring axially outwardly pressed cap or pin 56 which in the position shown has an over-all length greater than the distance between the wall 26 and the base of the socket 52 as shown.
  • the filter assembly 24 when the filter assembly 24 has its ball duct end 50 placed into the socket 52 guided by the U-shaped bracket 58, the other end may have its pin 56 pressed against the wall 26 of the tank 12 so that a resilient means, which may be a compression spring inside an axially aligned sleeve in the drum filter 24, will urge the whole assembly 24 and its ball duct 50 into sealing engagement with the socket 52 anchored in the opposite parallel wall 28 of the.tank 12. Since it is not possible to lift the ball duct 50 vertically out of its socket 52 in order to remove the drum filter assembly 24, the opposite end with pin 56 must be lifted first as shown in Figure 2 so that ample space above the tank 12 is had to remove the ball duct 50 from socket duct 52.
  • a resilient means which may be a compression spring inside an axially aligned sleeve in the drum filter 24
  • the ends of the drum filter assembly 24 may be provided with lifting handles 72 as shown in Figures 2 and 3, in which event it is necessary that the connec ⁇ tions 74 between each handle 72 and the non-rotatable bearing ends 76 and 78 should be inwardly directed or flexible plates to permit clearance from the side walls 24 and 26 as shown particularly at the right end of the filter 24.
  • the filter assembly 12 is a drum filter assembly 24 having foraminous non-reticulated metal screen surface 30 providing the filtering.
  • An end disc 80 is centrally apertured and may be integral through a hollow hub portion 82 with the ball duct 50.
  • Another end disc 84 is also communicable with hollow hub portion 82 and may be peripherally serrated to form a ratchet wheel engageable by a drive means, not shown, for rotating the filter assembly 12 for cleaning.
  • Filter assembly 24' is a disc filter assembly comprising a plurality of hollow disk filter elements 88 spaced along and in communica ⁇ tion with hub portion 82 which can, in number, increase the filter surface area as compared to a drum filter of the same volume.
  • Each disk filter element 88 includes the same foraminous surface 30 and an adapted doctor blade 34' for scraping the surface.
  • coolant is communicated through surface 30 of disk filter 88, whereoy machining chips, particulate as well as elongated contaminants form a filter cake on the surface, and is passed through the hollow disc and into hub 82.
  • a suction duct 92 which may comprise a separate chamber on the outside of the wall 28 of the settling tank 12.
  • the stationary bearing means 76 and 76' are provided with radially outwardly extending flanged wing portions 94 for adjustably supporting the flexible plastic scraping or doctor blades 34,34' against the outer filter surface 30.
  • the non-abrasive doctor blades 34,34' remove the fine solid particles that accumulate and form a filter cake on the foraminous non-reticulated surface 30 when the filter 24,24' is indexed at inter ⁇ vals by the drive means.
  • the suction in duct 92 is reduced to aid in allowing the removed particles to settle and be carried out by flights 96 of the conveyor.

Abstract

A filter apparatus (10) for filtering machine tool coolant is disclosed as including a filter assembly (12) including a foraminous non-reticulated metal screen (30) having minute openings and a smooth planar surface for providing improved scrape cleanability and preventing movement of machining chips, particulate and also elongate contaminants from one side of the filter (12) to the other side thereof.

Description

FILTER APPARATUS FOR MACHINE TOOL COOLANT
TECHNICAL FIELD
This invention relates to filters for filter¬ ing industrial liquids such as machine tool coolants and more particularly to filtering elongated contaminants onto a fora inous surface.
BACKGROUND AP.T
Conventional filter apparatus utilized in machine tool operations of the type described in U.S. Patent Noε. 4,507,061 and RE 32,135 separate machine tool chips and other contaminants from coolant so that clean coolant may be returned to the machine tools for reuse. Often times, the contaminants are very small and of an elongated shape. Usually one or more', horizontally disposed filter drums are located adjacent the bottom of a settlement tank. A suction is provided by a pump to the interior of the filter drum to pull coolant through the filter element to move the coolant from one side of the filter to the other. Filter cake, comprised of small chips and other contaminants, is formed on the outside of the drum surface. The drum is periodically indexed to enable a doctor blade to scrape off a portion of the accumulated filter cake, which drops to the bottom of the tank for removal by a dragout conveyor.
The conventional filter element is comprised of a continuous length of wedge shaped wire wrapped around a drum-shaped support. The filter element thereby includes elongated openings through which some elongated contaminants are allowed to pass if the contaminants are aligned in the direction of fluid movement as they strike the filter. The passage of these elongate contaminants allows the contaminants that pass through the filter to be recirculated to the machine tools.
An alternate type filter system that has been tried is fabricated from rectilinear mesh, wire cloth or the like. Although the minute square openings formed by the woven wire cloth are effective in preventing the passage of elongate contaminants, the surface is not a flat planar surface and thus becomes clogged when scrape cleaning is attempted.
DISCLOSURE OF INVENTION
An object of the present invention is to provide an improved filter apparatus for filtering industrial liquid such as machine tool coolant.
A further object of the invention is to provide an improved filter apparatus having a filter that provides improved scrape-cleanability of the filter surface.
A still further object of the invention is to provide a filter element that prevents movement of machining chips, particulate and also elongate contami¬ nants found in machine tool coolant from one side of the filter to the other side.
In carrying out the above objects and other objects of the invention, the filter apparatus includes a horizontal rotatable cylindrical drum filter in a settlement tank having a dragout conveyor. The settle- ment tank contains industrial liquids such as machine tool coolant or the like containing machining chips. These chips are found in a wide spectrum of particle sizes and shapes, including elongate contaminants. A circulating pump creates suction on one end of the drum filter. The drum filter has a fora inous surface comprised of a non-reticulated metal screen having minute openings and having a smooth planar surface. A doctor means is provided for scraping the foraminous surface to remove deposited contaminants. The minute openings in the foraminous surface are generally in the range of between 50 and 250 microns and provide improved scrape cleanability to the surface while preventing movement of machining chips (particulate including elon- gate contaminants) from one side of the filter to the other side.
In a preferred embodiment of the invention, minute openings are generally 120 microns. In one arrangement of the preferred embodiment, the minute openings in the direction of movement are conical in shape tapering outwardly in the direction of movement. In an alternative embodiment, the minute openings in the direction of movement are hourglass in shape.
A method for filtering machine tool coolant contaminants including the elongate contaminates from the industrial liquid includes the steps of interposing a foraminous filter surface perforated with a plurality of minute openings configured to pass the fluid while preventing passage of contaminant into a flow of the contaminated industrial liquid.
The objects, features, and advantages of the present invention are readily apparent from the follow- ing detailed description of the best mode for carrying out the invention when taken in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGURE 1 is a perspective view of a filter system including a removable drum filter having a non- reticulated foraminous surface constructed in accordance with the present invention;
FIGURE 2 is a sectional partial plan view of the filter system of Figure 1 illustrating the remov¬ ability of a drum filter assembly;
FIGURE 3 is a perspective view of the drum filter assembly;
FIGURE 4 is a perspective partial view of a disc filter assembly substitutable for the drum filter assembly in the filter system of Figure 1;
FIGURE 5 is a sectional plan view taken along lines 5-5 in Figure 4 of a disc filter element of the disc filter assembly of illustrating communication of the machine tool coolant;
FIGURE 6 is an exploded planar view taken along lines 6-6 in Figures 3 and 5 illustrating a section of a first embodiment of the foraminous non- reticulated surface of the filters of the present inven- tion;
FIGURE 7 is a cross-sectional view taken along lines 7-7 in Figure 6; FIGURE 8 is an exploded planar view like Figure 6 illustrating a second embodiment of the foram¬ inous non-reticulated surface of the filters of the present invention; and
FIGURE 9 is a cross-sectional view taken along lines 9-9 in Figure 8.
BEST MODE FOR CARRYING OUT THE INVENTION
With reference to Figure 1 of the drawings, a filter apparatus for filtering machine tool coolant con- εtructed in accordance with the present invention is generally indicated by reference numeral 10. As is hereinafter more fully described, apparatus 10.includes a filter assembly 12 which is easier to keep clean and that prevents machining chips, particulate as well as elongate contaminants in the coolant from being recircu¬ lated to the machine tools.
Referring again to Figure 1, a settling tank 14 is set into a pit disposed below the floor level or elevation F in an industrial environment. Tank 14 is generally rectilinear in configuration and has a sloping end wall or ramp 16 for use in conjunction with a dragout conveyor 18. Tank 14 is comprised of two discrete compartments; a dirty or contaminated coolant compartment, designated 20, for receiving dirty coolant from trough T in communication with the machine tools, also not shown; and a clean coolant compartment 22 for receiving clean filtered coolant from tank 14.
Within dirty coolant compartment 20, there is provided a horizontally disposed drum filter assembly 24 between two parallel sides 26,28 of tank 14 for filter- ing the dirty coolant whereby clean coolant filtrate may be supplied machine tools as explained hereinafter. Preferably, drum filter 24, as best seen in Figure 3, has a foraminous surface 30 comprised of a non-reticu- lated metal screen having minute openings 32, as best seen in Figures 6-9, and a smooth planar surface. Minute openings 32 are preferably in the range of between 50 and 250 microns in diameter and most prefera¬ bly 120 microns. In a first configuration, shown in Figures 8 and 9, minute openings 32 in the direction of coolant movement are conical, tapering outwardly. In a second configuration, shown in Figures 6 and 7, minute openings 32 in the direction of coolant movement are hourglass in shape.
During operation of the filter apparatus 10, drum filter 24 collects a filter cake composed of machining chips (particulate including elongate contam¬ inants) from machine tool operations about its surface 30. Coolant is moved through the filter cake and ' surface 30 of the drum filter 24 into the interior of the drum. More particularly, a suction is drawn on the inside of drum 24 by pump P. Coolant in dirty filter tank compartment 20 thus passes through the filter cake and drum, and cleaned or filtered coolant is supplied by the pump P to the machine tools.
Dragout conveyor 18 is conventional in con¬ struction and serves to remove both the solids settled out from the coolant and the filter cake removed from the filter drum 24 by a doctor blade 34 shown in Figure 3, both of which settle to the bottom of tank compart¬ ment 20. Doctor blade 34 comprises a non-abrasive material, preferably a flexible plastic material, having a leading edge flexed to contact the surface 30 in a / - parallel relationship whereby the surface is easily cleaned. The solids removed from the bottom of the tank compartment 20 by conveyor 18 are deposited in a suit¬ able receptacle, not shown, at the end of the conveyor. For present purposes, it will be appreciated that clean coolant is supplied from the interior of the one or more filter drums 24 to the machine tools by operation of the pump P hereof. Clean coolant compartment 22 includes an elevated or false floor 36 above the lower tank wall bottom and which defines a lower chamber 38 for receiv¬ ing clean coolant from the suction side of filter drum via conduit 40.
Disposed in clean compartment 22 is a main outlet conduit 42 for connection with the machine tools. Thus, clean coolant is supplied the machine tools from the suction side of filter 24 by way of chamber 38, pump P and outlet conduit 42. The purpose of clean coolant compartment 22 is to provide a reservoir of clean coolant which can be supplied the machine tools when the drum filter 24 is indexed for cleaning. Thus, a valve, not shown, is opened affording communication between the clean coolant in chamber 38 and the clean coolant in the remainder of clean coolant compartment 22 above floor 36. In this manner, pump P suction is applied to the clean coolant in compartment 22 to supply coolant to the machine tools. The suction is also removed with respect to the inside of the drum filter assembly 24 to facili¬ tate cleaning filter cake from the outside surface of the drum. Upon closing this valve, pump suction to the filter drum is reestablished, as will become clear from the ensuing description. Referring now to Figures 2 and 3, drum filter 24 is shown to have axial extensions at each end, one end comprising a ball duct joint 50, the socket 52 of which is placed in an aperture 54 in the side wall 28 of tank 12; and the other end of which filter 24 is pro¬ vided with a spring axially outwardly pressed cap or pin 56 which in the position shown has an over-all length greater than the distance between the wall 26 and the base of the socket 52 as shown. Thus, when the filter assembly 24 has its ball duct end 50 placed into the socket 52 guided by the U-shaped bracket 58, the other end may have its pin 56 pressed against the wall 26 of the tank 12 so that a resilient means, which may be a compression spring inside an axially aligned sleeve in the drum filter 24, will urge the whole assembly 24 and its ball duct 50 into sealing engagement with the socket 52 anchored in the opposite parallel wall 28 of the.tank 12. Since it is not possible to lift the ball duct 50 vertically out of its socket 52 in order to remove the drum filter assembly 24, the opposite end with pin 56 must be lifted first as shown in Figure 2 so that ample space above the tank 12 is had to remove the ball duct 50 from socket duct 52.
Similarly, in installing the drum filter assembly 24, the same procedure must be followed. If desired, the ends of the drum filter assembly 24 may be provided with lifting handles 72 as shown in Figures 2 and 3, in which event it is necessary that the connec¬ tions 74 between each handle 72 and the non-rotatable bearing ends 76 and 78 should be inwardly directed or flexible plates to permit clearance from the side walls 24 and 26 as shown particularly at the right end of the filter 24. In a first arrangement of filter apparatus 10 shown in Figures 1-3, the filter assembly 12 is a drum filter assembly 24 having foraminous non-reticulated metal screen surface 30 providing the filtering. An end disc 80 is centrally apertured and may be integral through a hollow hub portion 82 with the ball duct 50. Another end disc 84 is also communicable with hollow hub portion 82 and may be peripherally serrated to form a ratchet wheel engageable by a drive means, not shown, for rotating the filter assembly 12 for cleaning.
In a second arrangement of filter apparatus 10, the drum filter assembly 24 shown in Figures 1 and 2 is replaced by disc filter assembly 24 ' , shown par¬ tially in Figures 4 and 5. Filter assembly 24' is a disc filter assembly comprising a plurality of hollow disk filter elements 88 spaced along and in communica¬ tion with hub portion 82 which can, in number, increase the filter surface area as compared to a drum filter of the same volume. Each disk filter element 88 includes the same foraminous surface 30 and an adapted doctor blade 34' for scraping the surface. As seen in Figure 5, coolant is communicated through surface 30 of disk filter 88, whereoy machining chips, particulate as well as elongated contaminants form a filter cake on the surface, and is passed through the hollow disc and into hub 82.
In either construction, clean liquid which passes through the surface 30 can flow unobstructedly out through the apertured disc 80 and hub 82, ball duct 50 and socket duct 52 into a suction duct 92 which may comprise a separate chamber on the outside of the wall 28 of the settling tank 12. The stationary bearing means 76 and 76' are provided with radially outwardly extending flanged wing portions 94 for adjustably supporting the flexible plastic scraping or doctor blades 34,34' against the outer filter surface 30. The non-abrasive doctor blades 34,34' remove the fine solid particles that accumulate and form a filter cake on the foraminous non-reticulated surface 30 when the filter 24,24' is indexed at inter¬ vals by the drive means. During this operation, the suction in duct 92 is reduced to aid in allowing the removed particles to settle and be carried out by flights 96 of the conveyor.
While the best mode for carrying out the invention has been described in detail, those familiar with the art to which this invention relates will recognize various alternative embodiments for practicing the invention as defined by the following claims.

Claims

WHAT IS CLAIMED IS;
1. A filter apparatus comprising a settle¬ ment tank containing industrial liquid, a filter im¬ mersed in the industrial liquid and having a foraminous surface, means for moving said liquid from one side of said filter to the other side thereof in a direction of movement for depositing contaminants on the foraminous surface, and doctor means for scraping the foraminous surface to remove the deposited contaminants, said foraminous surface comprising: a non-reticulated metal screen having minute openings and having a smooth planar surface facing said doctor means for providing improved scrape-cleanability to the surface and for preventing movement of contaminants from one side of the filter to the other side thereof.
2. Apparatus as in claim 1 wherein said minute openings are in the range of between 50 and 250 microns.
3. Apparatus as in claim 2 wherein said minute openings are generally 120 microns.
4. Apparatus as in claim 2 wherein said minute openings in the direction of movement are conical in shape.
5. * Apparatus as in claim 4 wherein said minute conical openings in the direction of movement taper outwardly.
6. Apparatus as in claim 2 wherein said minute openings in the direction of movement are hour¬ glass in shape.
7. Apparatus as in claim 1 wherein said non- reticulated screen is seamless.
8. A method for filtering elongate contami¬ nants from industrial liquid comprising the steps of: interposing a filter of a non-reticulated metal screen having minute openings and a smooth planar surface in a flow of the liquid, said minute openings configured to pass the fluid through said openings while preventing passage of contaminants through the filter.
9. A method as in claim 8 further including the step of scraping accumulated contaminant from said filter surface.
10. A method as in claim 8 wherein said minute openings are in the range of between 50 and 250 microns.
11. A method as in claim 10 wherein said minute openings are generally of 120 microns.
12. A method as in claim 10 wherein said minute openings are of a conical shape.
13. A method as in claim 10 wherein said minute openings are of an hourglass shape.
14. A method as in claim 8 wherein interpos¬ ing said filter surface includes wrapping said metal screen on a drum support to form a drum filter element.
15. A method as in claim 14 wherein the wrapped metal screen is seamless.
16. A method as in claim 8 wherein interpos¬ ing said metal screen includes seamlessly mounting said filter surface on a disc support to form a disc filter element.
EP91910926A 1990-08-30 1991-05-30 Filter apparatus for machine tool coolant Expired - Lifetime EP0545934B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US575338 1990-08-30
US07/575,338 US5158691A (en) 1990-08-30 1990-08-30 Filter apparatus and method for filtering contaminants from machine tool coolant
PCT/US1991/003809 WO1992004095A1 (en) 1990-08-30 1991-05-30 Filter apparatus for machine tool coolant

Publications (3)

Publication Number Publication Date
EP0545934A1 true EP0545934A1 (en) 1993-06-16
EP0545934A4 EP0545934A4 (en) 1993-07-21
EP0545934B1 EP0545934B1 (en) 1996-04-24

Family

ID=24299911

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91910926A Expired - Lifetime EP0545934B1 (en) 1990-08-30 1991-05-30 Filter apparatus for machine tool coolant

Country Status (7)

Country Link
US (1) US5158691A (en)
EP (1) EP0545934B1 (en)
JP (1) JPH05509031A (en)
AT (1) ATE137132T1 (en)
CA (1) CA2090222C (en)
DE (1) DE69119077T2 (en)
WO (1) WO1992004095A1 (en)

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Also Published As

Publication number Publication date
EP0545934B1 (en) 1996-04-24
EP0545934A4 (en) 1993-07-21
DE69119077T2 (en) 1996-08-22
CA2090222C (en) 1997-02-04
DE69119077D1 (en) 1996-05-30
JPH05509031A (en) 1993-12-16
WO1992004095A1 (en) 1992-03-19
US5158691A (en) 1992-10-27
ATE137132T1 (en) 1996-05-15

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